We investigate nuclear spin hyperpolarization from nitrogen vacancy centers in isotopically enriched diamonds with 13C concentrations up to 100%. 13C enrichment leads to hyperfine structure of the nitrogen vacancy electron spin resonance spectrum and as a result the spectrum of dynamic nuclear polarization. We show that strongly-coupled 13C spins in the first shell surrounding a nitrogen vacancy center generate resolved hyperfine splittings, but do not act as an intermediary in the transfer of hyperpolarization of bulk nuclear spins. High levels of 13C enrichment are desirable to increase the efficiency of hyperpolarizaiton for magnetic resonance signal enhancement, imaging contrast agents, and as a platform for quantum sensing and many-body physics.
@article{arxiv.1708.00561,
title = {Optically-pumped dynamic nuclear hyperpolarization in $^{13}$C enriched diamond},
author = {Anna J. Parker and Keunhong Jeong and Claudia E. Avalos and Birgit J. M. Hausmann and Christophoros C. Vassiliou and Alexander Pines and Jonathan P. King},
journal= {arXiv preprint arXiv:1708.00561},
year = {2019}
}